Re: [PATCH] HID: input: fix battery level reporting on BT mice

From: Martin van Es
Date: Tue Apr 03 2018 - 15:18:01 EST

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In reply to: Dmitry Torokhov: "[PATCH] HID: input: fix battery level reporting on BT mice"
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Hi Dimitry,

I reapplied the 3 commits I had to revert earlier and applied your patch. Have
correct battery level reading on my BT mouse back!

/sys/class/power_supply/hid-00:1f:20:fd:cb:be-battery# grep "" *
capacity:53
grep: device: Is a directory
model_name:Bluetooth Mouse M336/M337/M535
online:1
grep: power: Is a directory
grep: powers: Is a directory
present:1
scope:Device
status:Discharging
grep: subsystem: Is a directory
type:Battery
uevent:POWER_SUPPLY_NAME=hid-00:1f:20:fd:cb:be-battery
uevent:POWER_SUPPLY_PRESENT=1
uevent:POWER_SUPPLY_ONLINE=1
uevent:POWER_SUPPLY_CAPACITY=53
uevent:POWER_SUPPLY_MODEL_NAME=Bluetooth Mouse M336/M337/M535
uevent:POWER_SUPPLY_STATUS=Discharging
uevent:POWER_SUPPLY_SCOPE=Device

rdesc file is attached

Thx for the effort!

Best regards,
Martin van Es

On Tuesday, April 3, 2018 7:52:20 PM CEST Dmitry Torokhov wrote:
> The commit 581c4484769e ("HID: input: map digitizer battery usage")
> assumed that devices having input (qas opposed to feature) report for
> battery strength would report the data on their own, without the need to
> be polled by the kernel; unfortunately it is not so. Many wireless mice
> do not send unsolicited reports with battery strength data and have to
> be polled explicitly. As a complication, stylus devices on digitizers
> are not normally connected to the base and thus can not be polled - the
> base can only determine battery strength in the stylus when it is in
> proximity.
>
> To solve this issue, we add a special flag that tells the kernel
> to avoid polling the device (and expect unsolicited reports) and set it
> when report field with physical usage of digitizer stylus (HID_DG_STYLUS).
> Unless this flag is set, and we have not seen the unsolicited reports,
> the kernel will attempt to poll the device when userspace attempts to
> read "capacity" and "state" attributes of power_supply object
> corresponding to the devices battery.
>
> Fixes: 581c4484769e ("HID: input: map digitizer battery usage")
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=198095
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
> ---
>
> Martin, give this patch a try and reply with your name/email if you
> want to be credited for reporting/testing.
>
> Thanks!
>
> drivers/hid/hid-input.c | 24 +++++++++++++++++-------
> include/linux/hid.h | 9 ++++++++-
> 2 files changed, 25 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
> index 6836a856c243..930652c25120 100644
> --- a/drivers/hid/hid-input.c
> +++ b/drivers/hid/hid-input.c
> @@ -387,7 +387,8 @@ static int hidinput_get_battery_property(struct
> power_supply *psy, break;
>
> case POWER_SUPPLY_PROP_CAPACITY:
> - if (dev->battery_report_type == HID_FEATURE_REPORT) {
> + if (dev->battery_status != HID_BATTERY_REPORTED &&
> + !dev->battery_avoid_query) {
> value = hidinput_query_battery_capacity(dev);
> if (value < 0)
> return value;
> @@ -403,17 +404,17 @@ static int hidinput_get_battery_property(struct
> power_supply *psy, break;
>
> case POWER_SUPPLY_PROP_STATUS:
> - if (!dev->battery_reported &&
> - dev->battery_report_type == HID_FEATURE_REPORT) {
> + if (dev->battery_status != HID_BATTERY_REPORTED &&
> + !dev->battery_avoid_query) {
> value = hidinput_query_battery_capacity(dev);
> if (value < 0)
> return value;
>
> dev->battery_capacity = value;
> - dev->battery_reported = true;
> + dev->battery_status = HID_BATTERY_QUERIED;
> }
>
> - if (!dev->battery_reported)
> + if (dev->battery_status == HID_BATTERY_UNKNOWN)
> val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
> else if (dev->battery_capacity == 100)
> val->intval = POWER_SUPPLY_STATUS_FULL;
> @@ -486,6 +487,14 @@ static int hidinput_setup_battery(struct hid_device
> *dev, unsigned report_type, dev->battery_report_type = report_type;
> dev->battery_report_id = field->report->id;
>
> + /*
> + * Stylus is normally not connected to the device and thus we
> + * can't query the device and get meaningful battery strength.
> + * We have to wait for the device to report it on its own.
> + */
> + dev->battery_avoid_query = report_type == HID_INPUT_REPORT &&
> + field->physical == HID_DG_STYLUS;
> +
> dev->battery = power_supply_register(&dev->dev, psy_desc, &psy_cfg);
> if (IS_ERR(dev->battery)) {
> error = PTR_ERR(dev->battery);
> @@ -530,9 +539,10 @@ static void hidinput_update_battery(struct hid_device
> *dev, int value)
>
> capacity = hidinput_scale_battery_capacity(dev, value);
>
> - if (!dev->battery_reported || capacity != dev->battery_capacity) {
> + if (dev->battery_status != HID_BATTERY_REPORTED ||
> + capacity != dev->battery_capacity) {
> dev->battery_capacity = capacity;
> - dev->battery_reported = true;
> + dev->battery_status = HID_BATTERY_REPORTED;
> power_supply_changed(dev->battery);
> }
> }
> diff --git a/include/linux/hid.h b/include/linux/hid.h
> index 8da3e1f48195..26240a22978a 100644
> --- a/include/linux/hid.h
> +++ b/include/linux/hid.h
> @@ -516,6 +516,12 @@ enum hid_type {
> HID_TYPE_USBNONE
> };
>
> +enum hid_battery_status {
> + HID_BATTERY_UNKNOWN = 0,
> + HID_BATTERY_QUERIED, /* Kernel explicitly queried battery strength */
> + HID_BATTERY_REPORTED, /* Device sent unsolicited battery strength
report
> */ +};
> +
> struct hid_driver;
> struct hid_ll_driver;
>
> @@ -558,7 +564,8 @@ struct hid_device { /* device report
descriptor */
> __s32 battery_max;
> __s32 battery_report_type;
> __s32 battery_report_id;
> - bool battery_reported;
> + enum hid_battery_status battery_status;
> + bool battery_avoid_query;
> #endif
>
> unsigned int status; /* see STAT flags above */
05 01 09 02 a1 01 85 02 09 01 a1 00 05 09 19 01 29 08 15 00 25 01 75 01 95 08 81 02 05 01 09 30 09 31 16 01 f8 26 ff 07 75 0c 95 02 81 06 09 38 15 81 25 7f 75 08 95 01 81 06 05 0c 0a 38 02 75 08 95 01 81 06 c0 c0 05 0c 09 01 a1 01 85 03 05 06 09 20 15 00 26 64 00 75 08 95 01 81 02 c0 06 00 ff 09 01 a1 01 85 10 75 08 95 06 15 00 26 ff 00 09 01 81 00 09 01 91 00 c0 06 00 ff 09 02 a1 01 85 11 75 08 95 13 15 00 26 ff 00 09 02 81 00 09 02 91 00 c0 05 01 09 06 a1 01 85 04 75 01 95 08 05 07 19 e0 29 e7 15 00 25 01 81 02 95 01 75 08 81 03 95 05 75 01 05 08 19 01 29 05 91 02 95 01 75 03 91 03 95 06 75 08 15 00 26 ff 00 05 07 19 00 29 ff 81 00 c0 05 0c 09 01 a1 01 85 05 15 00 25 01 75 01 95 02 0a 25 02 0a 24 02 81 02 95 01 75 06 81 03 c0 00

INPUT(2)[INPUT]
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Physical(GenericDesktop.Pointer)
Application(GenericDesktop.Mouse)
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Field(1)
Physical(GenericDesktop.Pointer)
Application(GenericDesktop.Mouse)
Usage(2)
GenericDesktop.X
GenericDesktop.Y
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Flags( Variable Relative )
Field(2)
Physical(GenericDesktop.Pointer)
Application(GenericDesktop.Mouse)
Usage(1)
GenericDesktop.Wheel
Logical Minimum(-127)
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Flags( Variable Relative )
Field(3)
Physical(GenericDesktop.Pointer)
Application(GenericDesktop.Mouse)
Usage(1)
Consumer.HorizontalWheel
Logical Minimum(-127)
Logical Maximum(127)
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Report Offset(40)
Flags( Variable Relative )
INPUT(3)[INPUT]
Field(0)
Application(Consumer.0001)
Usage(1)
GenericDeviceControls.BatteryStrength
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Flags( Variable Absolute )
INPUT(16)[INPUT]
Field(0)
Application(ff00.0001)
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ff00.0001
ff00.0001
ff00.0001
ff00.0001
ff00.0001
ff00.0001
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INPUT(17)[INPUT]
Field(0)
Application(ff00.0002)
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ff00.0002
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INPUT(4)[INPUT]
Field(0)
Application(GenericDesktop.Keyboard)
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Keyboard.00e0
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Keyboard.00fe
Keyboard.00ff
Logical Minimum(0)
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Report Size(8)
Report Count(6)
Report Offset(16)
Flags( Array Absolute )
INPUT(5)[INPUT]
Field(0)
Application(Consumer.0001)
Usage(2)
Consumer.0225
Consumer.0224
Logical Minimum(0)
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OUTPUT(16)[OUTPUT]
Field(0)
Application(ff00.0001)
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ff00.0001
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ff00.0001
Logical Minimum(0)
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OUTPUT(17)[OUTPUT]
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OUTPUT(4)[OUTPUT]
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Button.0001 ---> Key.LeftBtn
Button.0002 ---> Key.RightBtn
Button.0003 ---> Key.MiddleBtn
Button.0004 ---> Key.SideBtn
Button.0005 ---> Key.ExtraBtn
Button.0006 ---> Key.ForwardBtn
Button.0007 ---> Key.BackBtn
Button.0008 ---> Key.TaskBtn
GenericDesktop.X ---> Relative.X
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ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
Keyboard.00e0 ---> Key.LeftControl
Keyboard.00e1 ---> Key.LeftShift
Keyboard.00e2 ---> Key.LeftAlt
Keyboard.00e3 ---> Key.LeftMeta
Keyboard.00e4 ---> Key.RightCtrl
Keyboard.00e5 ---> Key.RightShift
Keyboard.00e6 ---> Key.RightAlt
Keyboard.00e7 ---> Key.RightMeta
Keyboard.0000 ---> Sync.Report
Keyboard.0001 ---> Sync.Report
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Keyboard.0004 ---> Key.A
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Keyboard.0007 ---> Key.D
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Keyboard.001d ---> Key.Z
Keyboard.001e ---> Key.1
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Keyboard.0020 ---> Key.3
Keyboard.0021 ---> Key.4
Keyboard.0022 ---> Key.5
Keyboard.0023 ---> Key.6
Keyboard.0024 ---> Key.7
Keyboard.0025 ---> Key.8
Keyboard.0026 ---> Key.9
Keyboard.0027 ---> Key.0
Keyboard.0028 ---> Key.Enter
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Keyboard.002a ---> Key.Backspace
Keyboard.002b ---> Key.Tab
Keyboard.002c ---> Key.Space
Keyboard.002d ---> Key.Minus
Keyboard.002e ---> Key.Equal
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Keyboard.0031 ---> Key.BackSlash
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Keyboard.0034 ---> Key.Apostrophe
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Keyboard.003a ---> Key.F1
Keyboard.003b ---> Key.F2
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Keyboard.003e ---> Key.F5
Keyboard.003f ---> Key.F6
Keyboard.0040 ---> Key.F7
Keyboard.0041 ---> Key.F8
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Keyboard.0044 ---> Key.F11
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Keyboard.0046 ---> Key.SysRq
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Keyboard.0048 ---> Key.Pause
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Keyboard.004a ---> Key.Home
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Keyboard.004c ---> Key.Delete
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Keyboard.0053 ---> Key.NumLock
Keyboard.0054 ---> Key.KPSlash
Keyboard.0055 ---> Key.KPAsterisk
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Keyboard.0057 ---> Key.KPPlus
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Keyboard.0059 ---> Key.KP1
Keyboard.005a ---> Key.KP2
Keyboard.005b ---> Key.KP3
Keyboard.005c ---> Key.KP4
Keyboard.005d ---> Key.KP5
Keyboard.005e ---> Key.KP6
Keyboard.005f ---> Key.KP7
Keyboard.0060 ---> Key.KP8
Keyboard.0061 ---> Key.KP9
Keyboard.0062 ---> Key.KP0
Keyboard.0063 ---> Key.KPDot
Keyboard.0064 ---> Key.102nd
Keyboard.0065 ---> Key.Compose
Keyboard.0066 ---> Key.Power
Keyboard.0067 ---> Key.KPEqual
Keyboard.0068 ---> Key.F13
Keyboard.0069 ---> Key.F14
Keyboard.006a ---> Key.F15
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Keyboard.006e ---> Key.F19
Keyboard.006f ---> Key.F20
Keyboard.0070 ---> Key.F21
Keyboard.0071 ---> Key.F22
Keyboard.0072 ---> Key.F23
Keyboard.0073 ---> Key.F24
Keyboard.0074 ---> Key.Open
Keyboard.0075 ---> Key.Help
Keyboard.0076 ---> Key.Props
Keyboard.0077 ---> Key.Front
Keyboard.0078 ---> Key.Stop
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Keyboard.007a ---> Key.Undo
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Keyboard.007c ---> Key.Copy
Keyboard.007d ---> Key.Paste
Keyboard.007e ---> Key.Find
Keyboard.007f ---> Key.Mute
Keyboard.0080 ---> Key.VolumeUp
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Keyboard.0082 ---> Key.Unknown
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Keyboard.0085 ---> Key.KPComma
Keyboard.0086 ---> Key.Unknown
Keyboard.0087 ---> Key.RO
Keyboard.0088 ---> Key.Katakana/Hiragana
Keyboard.0089 ---> Key.Yen
Keyboard.008a ---> Key.Henkan
Keyboard.008b ---> Key.Muhenkan
Keyboard.008c ---> Key.KPJpComma
Keyboard.008d ---> Key.Unknown
Keyboard.008e ---> Key.Unknown
Keyboard.008f ---> Key.Unknown
Keyboard.0090 ---> Key.Hangeul
Keyboard.0091 ---> Key.Hanja
Keyboard.0092 ---> Key.Katakana
Keyboard.0093 ---> Key.HIRAGANA
Keyboard.0094 ---> Key.Zenkaku/Hankaku
Keyboard.0095 ---> Key.Unknown
Keyboard.0096 ---> Key.Unknown
Keyboard.0097 ---> Key.Unknown
Keyboard.0098 ---> Key.Unknown
Keyboard.0099 ---> Key.Unknown
Keyboard.009a ---> Key.Unknown
Keyboard.009b ---> Key.Unknown
Keyboard.009c ---> Key.Delete
Keyboard.009d ---> Key.Unknown
Keyboard.009e ---> Key.Unknown
Keyboard.009f ---> Key.Unknown
Keyboard.00a0 ---> Key.Unknown
Keyboard.00a1 ---> Key.Unknown
Keyboard.00a2 ---> Key.Unknown
Keyboard.00a3 ---> Key.Unknown
Keyboard.00a4 ---> Key.Unknown
Keyboard.00a5 ---> Key.Unknown
Keyboard.00a6 ---> Key.Unknown
Keyboard.00a7 ---> Key.Unknown
Keyboard.00a8 ---> Key.Unknown
Keyboard.00a9 ---> Key.Unknown
Keyboard.00aa ---> Key.Unknown
Keyboard.00ab ---> Key.Unknown
Keyboard.00ac ---> Key.Unknown
Keyboard.00ad ---> Key.Unknown
Keyboard.00ae ---> Key.Unknown
Keyboard.00af ---> Key.Unknown
Keyboard.00b0 ---> Key.Unknown
Keyboard.00b1 ---> Key.Unknown
Keyboard.00b2 ---> Key.Unknown
Keyboard.00b3 ---> Key.Unknown
Keyboard.00b4 ---> Key.Unknown
Keyboard.00b5 ---> Key.Unknown
Keyboard.00b6 ---> Key.KPLeftParenthesis
Keyboard.00b7 ---> Key.KPRightParenthesis
Keyboard.00b8 ---> Key.Unknown
Keyboard.00b9 ---> Key.Unknown
Keyboard.00ba ---> Key.Unknown
Keyboard.00bb ---> Key.Unknown
Keyboard.00bc ---> Key.Unknown
Keyboard.00bd ---> Key.Unknown
Keyboard.00be ---> Key.Unknown
Keyboard.00bf ---> Key.Unknown
Keyboard.00c0 ---> Key.Unknown
Keyboard.00c1 ---> Key.Unknown
Keyboard.00c2 ---> Key.Unknown
Keyboard.00c3 ---> Key.Unknown
Keyboard.00c4 ---> Key.Unknown
Keyboard.00c5 ---> Key.Unknown
Keyboard.00c6 ---> Key.Unknown
Keyboard.00c7 ---> Key.Unknown
Keyboard.00c8 ---> Key.Unknown
Keyboard.00c9 ---> Key.Unknown
Keyboard.00ca ---> Key.Unknown
Keyboard.00cb ---> Key.Unknown
Keyboard.00cc ---> Key.Unknown
Keyboard.00cd ---> Key.Unknown
Keyboard.00ce ---> Key.Unknown
Keyboard.00cf ---> Key.Unknown
Keyboard.00d0 ---> Key.Unknown
Keyboard.00d1 ---> Key.Unknown
Keyboard.00d2 ---> Key.Unknown
Keyboard.00d3 ---> Key.Unknown
Keyboard.00d4 ---> Key.Unknown
Keyboard.00d5 ---> Key.Unknown
Keyboard.00d6 ---> Key.Unknown
Keyboard.00d7 ---> Key.Unknown
Keyboard.00d8 ---> Key.Delete
Keyboard.00d9 ---> Key.Unknown
Keyboard.00da ---> Key.Unknown
Keyboard.00db ---> Key.Unknown
Keyboard.00dc ---> Key.Unknown
Keyboard.00dd ---> Key.Unknown
Keyboard.00de ---> Key.Unknown
Keyboard.00df ---> Key.Unknown
Keyboard.00e0 ---> Key.LeftControl
Keyboard.00e1 ---> Key.LeftShift
Keyboard.00e2 ---> Key.LeftAlt
Keyboard.00e3 ---> Key.LeftMeta
Keyboard.00e4 ---> Key.RightCtrl
Keyboard.00e5 ---> Key.RightShift
Keyboard.00e6 ---> Key.RightAlt
Keyboard.00e7 ---> Key.RightMeta
Keyboard.00e8 ---> Key.PlayPause
Keyboard.00e9 ---> Key.StopCD
Keyboard.00ea ---> Key.PreviousSong
Keyboard.00eb ---> Key.NextSong
Keyboard.00ec ---> Key.EjectCD
Keyboard.00ed ---> Key.VolumeUp
Keyboard.00ee ---> Key.VolumeDown
Keyboard.00ef ---> Key.Mute
Keyboard.00f0 ---> Key.WWW
Keyboard.00f1 ---> Key.Back
Keyboard.00f2 ---> Key.Forward
Keyboard.00f3 ---> Key.Stop
Keyboard.00f4 ---> Key.Find
Keyboard.00f5 ---> Key.ScrollUp
Keyboard.00f6 ---> Key.ScrollDown
Keyboard.00f7 ---> Key.Edit
Keyboard.00f8 ---> Key.Sleep
Keyboard.00f9 ---> Key.Coffee
Keyboard.00fa ---> Key.Refresh
Keyboard.00fb ---> Key.Calc
Keyboard.00fc ---> Key.Unknown
Keyboard.00fd ---> Key.Unknown
Keyboard.00fe ---> Key.Unknown
Keyboard.00ff ---> Key.Unknown
Consumer.0225 ---> Key.Forward
Consumer.0224 ---> Key.Back
ff00.0001 ---> Sync.Report
ff00.0001 ---> Sync.Report
ff00.0001 ---> Sync.Report
ff00.0001 ---> Sync.Report
ff00.0001 ---> Sync.Report
ff00.0001 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
ff00.0002 ---> Sync.Report
LED.NumLock ---> LED.NumLock
LED.CapsLock ---> LED.CapsLock
LED.ScrollLock ---> LED.ScrollLock
LED.Compose ---> LED.Compose
LED.Kana ---> LED.Kana

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